When Ted Price says, you have 9 children but can only claim 3, this is incorrect at this point in the series. He has 8 children. He does not adopt Cara Lynn, Nikki's daughter with JJ until Season 5.
When Sarah, Scott, Ben, and Heather are sitting in the car debating whether or not to go ahead with Sarah and Scott's wedding, Heather tells Ben that she has to be back by 8 PM because the dorm at BYU has a strict curfew. The dorms at BYU-Utah do not have curfews, and all students are provided with keys that get them into the dorms at all hours.
When announcing to his wives his definite decision to run for the office, Bill says the polygamy is misdemeanor and won't cost him the office. But polygamy is a felony in Utah, Bill of all people would know this for sure.